Error when opening pgAdmin 4 on mac

Question

I have installed version 4-1.5, but when opening it, it always shows this error \"The application server could not be contacted.\"

Answer 1

I had the same issue, I fixed it by stopping the service in Postgres app, then start pgAdmin, and then start the Postgres service. I was able to connect it after that. Hope this help.

Answer 2

I had same error, but in my case I use wrong port number for the database

Answer 3

On my system Safari is the problem as it was default browser.

To fix, make Chrome your default browser and try relaunching pgadmin4

OR

Manually fix by $ cat ~/.pgAdmin4.5704814747986328352.addr http://127.0.0.1:62631/?key=0ec25e6a-dfe2-483e-9814-b315ea87c3cf

Paste what you get in Chrome

Answer 4

I removed the local directory hidden and resolved:

$ cd ~
$ rm -r .pgadmin/

Note: macOS Sierra (10.12.6) and pgAdmin 4-1.6. Also you are going to loose configuration data like database list tree, et al.

The Databases will remain intact since you are modifying/deleting PgAdmin related data not any of Postgresql itself.